Meteor observed impacting the Moon: impossible??

A friend's son claims to have seen a small bright object strike the Moon's surface, raising a cloud of dust. Is this possible to observe at about 50-70x, or is this completely improbable. The object would have to be the size of a city, I would imagine. Do events like this happen often?

Thanks, if anybody can figure this one out for me.

Robert

Video astronomers have recorded impacts on the dark side of a partial phase moon during meteor showers. I don't recall what magnification they were imaging at but all they were able to record is a small flash, no dust clouds. I doubt the dust would be seen except with a very, very large impact and only if it happened right on the edge of the disc.
Even when they crashed the moon probe (Clementine I think) into the dark side of a crater no plume was visible and there were alot of scopes observing that event.

I can't say for sure if he saw what he thought he saw or not. Highly unlikely though, unless it was a monsterous object.

Robert W.